chore(buildpacks): update heroku-buildpack-nodejs to v106

See heroku/heroku-buildpack-nodejs@v104...v106

Author: mboersma

rootfs/builder/install-buildpacks

@@ -34,7 +34,7 @@ download_buildpack https://github.com/heroku/heroku-buildpack-go.git
 download_buildpack https://github.com/heroku/heroku-buildpack-gradle.git         v22      04-gradle
 download_buildpack https://github.com/heroku/heroku-buildpack-grails.git         v21      05-grails
 download_buildpack https://github.com/heroku/heroku-buildpack-java.git           v52      06-java
-download_buildpack https://github.com/heroku/heroku-buildpack-nodejs.git         v104     07-nodejs
+download_buildpack https://github.com/heroku/heroku-buildpack-nodejs.git         v106     07-nodejs
 download_buildpack https://github.com/heroku/heroku-buildpack-php.git            v121     08-php
 download_buildpack https://github.com/heroku/heroku-buildpack-play.git           v26      09-play
 download_buildpack https://github.com/heroku/heroku-buildpack-python.git         v103     10-python